Chem. Anal. (Warsaw), 50, 905 (2005)
Determination of Phenol in Wastewater by Aditya Shukla1, Saroj Sharma1, Kamlesh Shrivas1, Khageshwar Singh Patel*1 and Peter Hoffmann2 School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur492010, CG, India 2 Department of Analytical Chemistry, School of Material Science, Technical University Darmstadt, Petersenstr. 23, 64287-Darmstadt, Germany 1
Key words:
phenol, analysis, spectrophotometry, vanadium(V), N-Hydroxy N,N`-diphenylbenzamidine, waste water
Aminoantipyrine is a widely used reagent for spectrophotometric determination of PhOHs. Since its colour development lasts rather long, there was a need for a new, simple method for spectrophotometric determination of phenols in wastewater. In the new approach, PhOH reacts with vanadium(V) and N-hydroxy-N,N`-diphenylbenzamidine (HODPBA) to form blue-coloured complex extractable to chloroform. Its apparent molar absorptivity is 1.00 × 104 L mole1 cm1 at lmax = 600 nm. The method provides detection limit of 30 ng mL1. Calibration curve is linear up to PhOH concentration of 3.0 mg mL1. Calibration plot parameters were as follows: enrichment factor 5, slope 0.1053, intercept 0.0005, and correlation coefficient +0.99. Determination conditions were optimised in the course of analysis. The proposed method was found to be highly selective towards the determination of PhOH. It has been applied to the determination of PhOH in municipal and industrial wastewater samples. Aminoantypiryna jest powszechnie stosowanym reagentem do spektrofotometrycznego oznaczania PhOHs, jednak d³ugotrwa³e powstawanie barwy stwarza potrzebê opracowania nowej, prostszej metody spektrofotometrycznego oznaczania fenoli w ciekach. W proponowanej metodzie PhOH reaguje z wanadem i N-hydroksy-N,N`-difenylobenzamidyn¹ (HODPBA) daj¹c niebieski kompleks rozpuszczalny w chloroformie. Absorpcja molowa komplesku wynosi 1,00 × 104 L mol1 cm1 przy d³ugoci fali lmax = 600 nm. Granica wykrywalnoci wynosi 30 ng mL1. Przebieg krzywej kalibracji jest liniowy do stê¿enia PhOH 3,0 µg mL1. Parametry kalibracji s¹ nastêpuj¹ce: wspó³czynnik wzbogacenia 5, nachylenie krzywej 0,1053, przeciêcie z osi¹ rzêdnych w punkcie 0,005, wspó³czynnik korelacji + 0,99. Warunki oznaczeñ zosta³y zoptymalizowane w toku analiz. Proponowana metoda jest wysoce selektywana i zosta³a zastosowana do oznaczania PhOH w ciekach miejskich i przemys³owych. * Corresponding author. E-mail:
[email protected]
